HandyShopper for Palm OS is a extremely neat and useful way to organize any sort of list you might need. It was originally designed for keeping grocery lists but has grown far beyond that.
I use it to create reusable checklists for software installations and configurations, packing lists for trips both large and small and, of course, groceries.
Handyshopper even has its own mailing list (over 2000 members) where you can discuss new ways to use the program with other, like-minded people.
Information via Versiontracker.com.